0a0a85b3e0
of the kernel, and also most of the dynamic parts of the kernel. Additionally, 4MB pages will be allocated for display buffers as appropriate (only.) The 4MB support for SMP isn't complete, but doesn't interfere with operation either.
260 lines
8.3 KiB
C
260 lines
8.3 KiB
C
/*
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* Copyright (c) 1991 Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department and William Jolitz of UUNET Technologies Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Derived from hp300 version by Mike Hibler, this version by William
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* Jolitz uses a recursive map [a pde points to the page directory] to
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* map the page tables using the pagetables themselves. This is done to
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* reduce the impact on kernel virtual memory for lots of sparse address
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* space, and to reduce the cost of memory to each process.
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*
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* from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
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* from: @(#)pmap.h 7.4 (Berkeley) 5/12/91
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* $Id: pmap.h,v 1.51 1997/06/22 16:03:54 peter Exp $
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*/
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#ifndef _MACHINE_PMAP_H_
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#define _MACHINE_PMAP_H_
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/*
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* Page-directory and page-table entires follow this format, with a few
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* of the fields not present here and there, depending on a lot of things.
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*/
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/* ---- Intel Nomenclature ---- */
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#define PG_V 0x001 /* P Valid */
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#define PG_RW 0x002 /* R/W Read/Write */
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#define PG_U 0x004 /* U/S User/Supervisor */
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#define PG_NC_PWT 0x008 /* PWT Write through */
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#define PG_NC_PCD 0x010 /* PCD Cache disable */
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#define PG_A 0x020 /* A Accessed */
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#define PG_M 0x040 /* D Dirty */
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#define PG_PS 0x080 /* PS Page size (0=4k,1=4M) */
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#define PG_G 0x100 /* G Global */
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#define PG_AVAIL1 0x200 /* / Available for system */
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#define PG_AVAIL2 0x400 /* < programmers use */
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#define PG_AVAIL3 0x800 /* \ */
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/* Our various interpretations of the above */
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#define PG_W PG_AVAIL1 /* "Wired" pseudoflag */
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#define PG_MANAGED PG_AVAIL2
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#define PG_FRAME (~PAGE_MASK)
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#define PG_PROT (PG_RW|PG_U) /* all protection bits . */
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#define PG_N (PG_NC_PWT|PG_NC_PCD) /* Non-cacheable */
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/*
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* Page Protection Exception bits
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*/
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#define PGEX_P 0x01 /* Protection violation vs. not present */
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#define PGEX_W 0x02 /* during a Write cycle */
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#define PGEX_U 0x04 /* access from User mode (UPL) */
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/*
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* Pte related macros
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*/
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#define VADDR(pdi, pti) ((vm_offset_t)(((pdi)<<PDRSHIFT)|((pti)<<PAGE_SHIFT)))
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#ifndef NKPT
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#define NKPT 9 /* actual number of kernel page tables */
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#endif
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#ifndef NKPDE
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#ifdef SMP
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#define NKPDE 62 /* addressable number of page tables/pde's */
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#else
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#define NKPDE 63 /* addressable number of page tables/pde's */
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#endif /* SMP */
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#endif
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/*
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* The *PTDI values control the layout of virtual memory
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*
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* XXX This works for now, but I am not real happy with it, I'll fix it
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* right after I fix locore.s and the magic 28K hole
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*
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* SMP_PRIVPAGES: The per-cpu address space is 0xff80000 -> 0xffbfffff
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*/
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#define APTDPTDI (NPDEPG-1) /* alt ptd entry that points to APTD */
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#ifdef SMP
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#define MPPTDI (APTDPTDI-1) /* per cpu ptd entry */
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#define KPTDI (MPPTDI-NKPDE) /* start of kernel virtual pde's */
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#else
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#define KPTDI (APTDPTDI-NKPDE)/* start of kernel virtual pde's */
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#endif /* SMP */
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#define PTDPTDI (KPTDI-1) /* ptd entry that points to ptd! */
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#define UMAXPTDI (PTDPTDI-1) /* ptd entry for user space end */
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#define UMAXPTEOFF (NPTEPG-UPAGES_HOLE) /* pte entry for user space end */
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/*
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* XXX doesn't really belong here I guess...
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*/
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#define ISA_HOLE_START 0xa0000
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#define ISA_HOLE_LENGTH (0x100000-ISA_HOLE_START)
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#ifndef LOCORE
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#include <sys/queue.h>
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typedef unsigned int *pd_entry_t;
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typedef unsigned int *pt_entry_t;
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#define PDESIZE sizeof(pd_entry_t) /* for assembly files */
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#define PTESIZE sizeof(pt_entry_t) /* for assembly files */
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/*
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* Address of current and alternate address space page table maps
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* and directories.
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*/
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#ifdef KERNEL
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extern pt_entry_t PTmap[], APTmap[], Upte;
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extern pd_entry_t PTD[], APTD[], PTDpde, APTDpde, Upde;
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extern pd_entry_t IdlePTD; /* physical address of "Idle" state directory */
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#endif
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#ifdef KERNEL
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/*
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* virtual address to page table entry and
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* to physical address. Likewise for alternate address space.
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* Note: these work recursively, thus vtopte of a pte will give
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* the corresponding pde that in turn maps it.
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*/
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#define vtopte(va) (PTmap + i386_btop(va))
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#define avtopte(va) (APTmap + i386_btop(va))
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/*
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* Routine: pmap_kextract
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* Function:
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* Extract the physical page address associated
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* kernel virtual address.
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*/
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static __inline vm_offset_t
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pmap_kextract(vm_offset_t va)
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{
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vm_offset_t pa;
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if ((pa = (vm_offset_t) PTD[va >> PDRSHIFT]) & PG_PS) {
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pa = (pa & ~(NBPDR - 1)) | (va & (NBPDR - 1));
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} else {
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pa = *(vm_offset_t *)vtopte(va);
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pa = (pa & PG_FRAME) | (va & PAGE_MASK);
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}
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return pa;
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}
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#if 0
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#define vtophys(va) (((int) (*vtopte(va))&PG_FRAME) | ((int)(va) & PAGE_MASK))
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#else
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#define vtophys(va) pmap_kextract(((vm_offset_t) (va)))
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#endif
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#define avtophys(va) (((int) (*avtopte(va))&PG_FRAME) | ((int)(va) & PAGE_MASK))
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#endif
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/*
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* Pmap stuff
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*/
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struct pv_entry;
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typedef struct {
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int pv_list_count;
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struct vm_page *pv_vm_page;
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TAILQ_HEAD(,pv_entry) pv_list;
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} pv_table_t;
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struct pmap {
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pd_entry_t *pm_pdir; /* KVA of page directory */
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vm_object_t pm_pteobj; /* Container for pte's */
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TAILQ_HEAD(,pv_entry) pm_pvlist; /* list of mappings in pmap */
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int pm_count; /* reference count */
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int pm_flags; /* pmap flags */
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struct pmap_statistics pm_stats; /* pmap statistics */
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struct vm_page *pm_ptphint; /* pmap ptp hint */
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};
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#define pmap_resident_count(pmap) (pmap)->pm_stats.resident_count
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#define PM_FLAG_LOCKED 0x1
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#define PM_FLAG_WANTED 0x2
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typedef struct pmap *pmap_t;
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#ifdef KERNEL
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extern pmap_t kernel_pmap;
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#endif
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/*
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* For each vm_page_t, there is a list of all currently valid virtual
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* mappings of that page. An entry is a pv_entry_t, the list is pv_table.
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*/
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typedef struct pv_entry {
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pmap_t pv_pmap; /* pmap where mapping lies */
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vm_offset_t pv_va; /* virtual address for mapping */
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TAILQ_ENTRY(pv_entry) pv_list;
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#if PMAP_PVLIST
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TAILQ_ENTRY(pv_entry) pv_plist;
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#endif
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vm_page_t pv_ptem; /* VM page for pte */
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} *pv_entry_t;
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#define PV_ENTRY_NULL ((pv_entry_t) 0)
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#define PV_CI 0x01 /* all entries must be cache inhibited */
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#define PV_PTPAGE 0x02 /* entry maps a page table page */
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#ifdef KERNEL
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extern caddr_t CADDR1;
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extern pt_entry_t *CMAP1;
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extern vm_offset_t avail_end;
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extern vm_offset_t avail_start;
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extern vm_offset_t phys_avail[];
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extern vm_offset_t virtual_avail;
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extern vm_offset_t virtual_end;
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void pmap_bootstrap __P(( vm_offset_t, vm_offset_t));
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pmap_t pmap_kernel __P((void));
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void *pmap_mapdev __P((vm_offset_t, vm_size_t));
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unsigned *pmap_pte __P((pmap_t, vm_offset_t)) __pure2;
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vm_page_t pmap_use_pt __P((pmap_t, vm_offset_t));
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void pmap_set_opt __P((unsigned *));
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void pmap_set_opt_bsp __P((void));
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#endif /* KERNEL */
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#endif /* !LOCORE */
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#endif /* !_MACHINE_PMAP_H_ */
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